I am a prime number.
The double of myself is equal to the square of me.

which number am I?

What number divided by 4 is the same as that number minus 4?

What is black when you buy it, red when you use it, and gray when you throw it away?

Find the last number in the series below:

voN luJ yaM raM ---

Arrange the numbers 1, 2, 3, 4, 5, 6, 7, 8 and 9 above and below the division line in a manner that the thus formed fractions equal to 1/3.

(You can use one number only once)

Three people are in a room. Ronni looks at the Nile. The Nile looks at Senthil. Ronni is married but Senthil is not married. At any point, is a married person looking at an unmarried person? Yes, No or Cannot be determined.

Find the mistake in the below maths equations

A = 2
A(A-1) = 2(A-1)
A2-A = 2A-2
A2-2A = A-2
A(A-2) = A-2
A = 1

You are given with the following sum. Each of the letters can be decoded as a digit. If we tell you that D = 5, then can you solve it entirely?

DONALD
+GERALD
=ROBERT

What is the next number in the series?

15 29 56 108 208 ?

I can be cracked, made, told, and played. What am I?